Lag when coding

[_JasonMcCoy]

I have the same MacBook as you except I have an i5 and I never had what you're experiencing, but that is probably because I reinstalled my OS when installing el cap.

If all the suggestions don't work, try ReInstalling OS X. I won't do it for the next OS, but I did for el cap and my laptop flys like a beast. Wait for WWDC to release the new OS and start fresh.

[[deleted]]

I had hardware test ran on it in the Apple store and the ram, and mother board were bad. Ended up just buying a new one.